Maybe fuel, maybe ignition, maybe something wrong with tranny.
Mine got a lose wire and won't down shift sometime.
Vaccum leak will cause high idle on 4A-FE and irratic idle on 4A-GE.
Must be leaking on one of the vaccum hose. MAP hose leaking would be bad.
Get a can of throttle body cleaner, start the engine, spary it around the intake manifold, vaccum hose. If it stall where you spary, there is your leak.
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